GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog
GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P7090/1:b..l
rcu: 	(detected by 1, t=10502 jiffies, g=19165, q=232 ncpus=2)
task:syz.2.350       state:R  running task     stack:24736 pid:7090  tgid:7089  ppid:5824   task_flags:0x400040 flags:0x00080000
Call Trace:
 <TASK>
 __schedule+0x15dd/0x52d0
 preempt_schedule_irq+0x4d/0xa0
 irqentry_exit+0x599/0x620
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:lock_is_held_type+0x106/0x150
Code: 18 00 00 b8 ff ff ff ff 65 0f c1 05 04 00 70 07 83 f8 01 75 25 9c 58 a9 00 02 00 00 75 39 41 f7 c4 00 02 00 00 74 01 fb 89 d8 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 cb df 02 00 cc 90 0f 0b 90 48 c7
RSP: 0018:ffffc90004ce77e0 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 0000000000000001 RCX: 0000000000000046
RDX: ffff888102f7d7c0 RSI: ffffffff8e16c921 RDI: ffffffff8c27f180
RBP: 00000000ffffffff R08: ffffffff82009f7d R09: ffffffff8e75e5a0
R10: ffffc90004ce7940 R11: fffff5200099cf2b R12: 0000000000000246
R13: ffff888102f7d7c0 R14: ffffffff8e75e5a0 R15: 0000000000000002
 xas_start+0x295/0x770
 xas_load+0x2c/0x5b0
 filemap_get_entry+0x181/0x3f0
 shmem_get_folio_gfp+0x214/0x1420
 shmem_write_begin+0x16c/0x330
 generic_perform_write+0x2e2/0x8f0
 shmem_file_write_iter+0xf8/0x120
 vfs_write+0x61d/0xb90
 ksys_write+0x150/0x270
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f032d55cfce
RSP: 002b:00007f032e433da8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f032e4346c0 RCX: 00007f032d55cfce
RDX: 0000000001000000 RSI: 00007f0323200000 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 00007f032e433ee0 R14: 00007f032e433ea0 R15: 00007f0323200000
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g19165 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=7132
rcu: rcu_preempt kthread starved for 10502 jiffies! g19165 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:I stack:27744 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 __schedule+0x15dd/0x52d0
 schedule+0x164/0x360
 schedule_timeout+0x158/0x2c0
 rcu_gp_fqs_loop+0x312/0x11d0
 rcu_gp_kthread+0x9e/0x2b0
 kthread+0x388/0x470
 ret_from_fork+0x51e/0xb90
 ret_from_fork_asm+0x1a/0x30
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 7073 Comm: syz.1.345 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:_find_first_zero_bit+0x2e/0xb0
Code: 41 57 41 56 41 55 41 54 53 48 85 f6 74 46 48 89 f3 49 89 fe 49 bc 00 00 00 00 00 fc ff df 48 89 f8 48 c1 e8 03 42 80 3c 20 00 <74> 08 4c 89 f7 e8 88 f9 82 fd 49 8b 06 48 83 f8 ff 74 2b 45 31 ed
RSP: 0018:ffffc90006fe7c18 EFLAGS: 00000046
RAX: 1ffff11021671c2a RBX: 0000000000000002 RCX: 0000000080000001
RDX: dffffc0000000000 RSI: 0000000000000002 RDI: ffff88810b38e150
RBP: 0000000080000000 R08: 1ffff11021671ad9 R09: 0000000000000000
R10: ffff88810b38d814 R11: fffff52000dfcf78 R12: dffffc0000000000
R13: 0000000080000000 R14: ffff88810b38e150 R15: ffff88810b38d5c0
FS:  00007f1b150e76c0(0000) GS:ffff88818de65000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c3dae27 CR3: 0000000116910000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 sched_mm_cid_fork+0x5d5/0x1120
 bprm_execve+0xda1/0x1460
 do_execveat_common+0x50d/0x690
 __x64_sys_execveat+0xc7/0xf0
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1b1419c799
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f1b150e7028 EFLAGS: 00000246 ORIG_RAX: 0000000000000142
RAX: ffffffffffffffda RBX: 00007f1b14415fa0 RCX: 00007f1b1419c799
RDX: 0000000000000000 RSI: 0000200000000000 RDI: 0000000000000004
RBP: 00007f1b14232c99 R08: 0000000000001000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1b14416038 R14: 00007f1b14415fa0 R15: 00007ffe1d1eef28
 </TASK>
